1. half value layer refers tothe heel effect seen when the anode is placed at an angle to the electron stream in the x ray cathode tubethe rate at which an x ray photon transfer its energy to irradiated matterthe thickness of a substance required to reduce the number of x ray photons by halfthe time taken for x ray photons to travel half of the distance from the source to the objectQuestion 1 of 20 2. when a child is not able to hold the IOPA who should hold the filmradiographerparentassistantdentistQuestion 2 of 20 3. In the body which atom is useful in magnetic resonance imaging(MRI)SulphurNitrogenOxygenHydrogenQuestion 3 of 20 4. It is generally desirable that x-ray films be all of the following exceptFine grain sizeSensitive to visible lightCoated with emulsion on both sidesHigh speedQuestion 4 of 20 5. Bone death in radiation seen after radiation level of50 Gy30 Gy20 Gy40 GyQuestion 5 of 20 6. Black branching lines appear on a processed film. Which of the following is the most likely cause?developer cutoffstatic electricityfingernail damagefixer cutoffQuestion 6 of 20 7. the gold standard for the diagnosis of osteoporosis issingle energy x ray absorptiometryquantitative computed tomographydual energy x ray absorptiometryultrasoundQuestion 7 of 20 8. Film size used to evaluate TMJ4*3 inch8*10 inch5*7 inch10*12 inchQuestion 8 of 20 9. dead bone appear on a radiograph asradiolucentsalt and pepper appearancecotton wool appearanceradio opaqueQuestion 9 of 20 10. Which of the following statements about obtaining the most geometrically accurate image is false?The film should be parallel to the object.The central ray should be parallel to the object.The object-to-film distance should be short.The central ray should be perpendicular to the film.Question 10 of 20 11. The image of the coronoid process of the mandible often appears in periapical x-rays ofThe molar region of the mandibleThe incisor region of the maxillaThe incisor region of the mandibleThe molar region of the maxillaQuestion 11 of 20 12. All are advantages of digital radiography exceptDigital subtractionSize of the intraoral sensorThe ability to enhance the imagePatient educationQuestion 12 of 20 13. It is important that the film base be ____.Completely clearsensitive to XrayFlexibleopaque Question 13 of 20 14. Most radiosensitive phase of cell cycle isSG1G2S2Question 14 of 20 15. An anatomic structure which has a worm hole radiolucency is characteristic ofNutrient canalMandibular canalMaxillary sinusMental foramenQuestion 15 of 20 16. Dose equivalent is expressed in terms ofsievertcoulombsquality factorgrayQuestion 16 of 20 17. radioisotopes are used in the following technique exceptELISARIAmass spectroscopysequencing of nuceic acidsQuestion 17 of 20 18. the purpose of collimating an x ray beam is toremove the less penetrating x ray photonsreduce exposure timereduce the size of the beam to facilitate easier visualization of the central rayavoid delivering unnecessary radiation to the patientQuestion 18 of 20 19. Which property of x-ray is utilised in intensifying screensBiologicalBiochemicalPhysicalChemicalQuestion 19 of 20 20. sunburst appearance on radiograph is seen inosteofibromaosteosarcomaosteopetrosisx ray chestQuestion 20 of 20 Loading...
